Sewing machine



FIG. 1 is a front elevation of a sewing machine showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an elevational perspective view thereof; and

FIG. 8 is a reference view thereof 

The ornamental design for a sewing machine, as shown and described. 